Mentha piperita, a stamp issued by Taiwan in 2013
Here is some information about the stamp
I quote
Planting and the use of herb plants have grown to be a trend in recent years. To showcase the enchanting beauty of these multipurpose plants, Chunghwa Post is issuing a set of four stamps featuring Mentha × piperita, Rosmarinus officinalis, Salvia elegans, and Artemisia indica.
1. Mentha × piperita (NT$5): It is a perennial herbaceous plant of the family Lamiaceae. The plant has opposite, ovate or oval-shaped leaves. The flowers are either white or pink, and grown in whorls. It is edible, medicinally useful, and a common ingredient in essential oils, pesticides and pest repellants.
Mentha piperita, peppermint, is mentioned in
TREATING WINTER COLDS WITH HERBS
By Kate Koutrouboussis
THE MEDITERRANEAN GARDEN number 42, October 2005